how to assign value for the structured array in proto?

[KKevinTso]

i tried to assign the value for the structure in the proto. and i used the 'add_' method and 'writer' method in mcap lib.
it surely generated the *.mcap file. but it's very strange in foxglove software. SSI_MvVisionLaneMkr_Msg_0’s menber has the value in SSI_MvVisionLaneMkr_Msg_1's. and SSI_MvVisionLaneMkr_Msg_1's member has the value in SSI_MvVisionLaneMkr_Msg_0.

it seems they shared the same memery address.
so i debuged the process. The first cycle, SSI_MvVisionLaneMkr_Msg_0's address is 0x55555594ed40, SSI_MvVisionLaneMkr_Msg_1's address is 0x55555594ec90. the next cycle, they just exhacnged the address, and the following cycles, they did this again and agian.

it is my code below.

MvPlanningOutputInfoProto_namespace:: SSI_MvVisionLaneMkr_Bus* SSI_MvVisionLaneMkr_Msg_0 = SSI_MvVisPercpLaneInfo_Msg->add_ssi_vis_host_line();
// assign value for the menber in the struct called SSI_MvVisionLaneMkr_Bus
...
MvPlanningOutputInfoProto_namespace:: SSI_MvVisionLaneMkr_Bus* SSI_MvVisionLaneMkr_Msg_1 = SSI_MvVisPercpLaneInfo_Msg->add_ssi_vis_host_line();
// assign value for the menber in the struct called SSI_MvVisionLaneMkr_Bus
..